197 lines
8 KiB
HTML
197 lines
8 KiB
HTML
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|||
|
|
<HTML>
|
|||
|
|
<HEAD>
|
|||
|
|
<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8">
|
|||
|
|
<TITLE>"PTHREAD_BARRIER_DESTROY"(P) manual page</TITLE>
|
|||
|
|
<META NAME="GENERATOR" CONTENT="OpenOffice.org 2.0 (Linux)">
|
|||
|
|
<META NAME="CREATED" CONTENT="20050504;11372800">
|
|||
|
|
<META NAME="CHANGEDBY" CONTENT="Ross Johnson">
|
|||
|
|
<META NAME="CHANGED" CONTENT="20060408;9450100">
|
|||
|
|
<!-- manual page source format generated by PolyglotMan v3.2, -->
|
|||
|
|
<!-- available at http://polyglotman.sourceforge.net/ -->
|
|||
|
|
</HEAD>
|
|||
|
|
<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
|
|||
|
|
<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4>
|
|||
|
|
<P><A HREF="index.html">Reference Index</A></P>
|
|||
|
|
<P><A HREF="#toc">Table of Contents</A></P>
|
|||
|
|
<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
|
|||
|
|
<P>pthread_barrier_destroy, pthread_barrier_init - destroy and
|
|||
|
|
initialize a barrier object (<B>ADVANCED REALTIME THREADS</B>)
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
|
|||
|
|
<P><B>#include <pthread.h> </B>
|
|||
|
|
</P>
|
|||
|
|
<P><B>int pthread_barrier_destroy(pthread_barrier_t *</B><I>barrier</I><B>);
|
|||
|
|
<BR>int pthread_barrier_init(pthread_barrier_t *restrict</B> <I>barrier</I><B>,
|
|||
|
|
const pthread_barrierattr_t *restrict</B> <I>attr</I><B>, unsigned</B>
|
|||
|
|
<I>count</I><B>); </B>
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
|
|||
|
|
<P>The <B>pthread_barrier_destroy</B> function shall destroy the
|
|||
|
|
barrier referenced by <I>barrier</I> and release any resources used
|
|||
|
|
by the barrier. The effect of subsequent use of the barrier is
|
|||
|
|
undefined until the barrier is reinitialized by another call to
|
|||
|
|
<B>pthread_barrier_init</B> . An implementation may use this function
|
|||
|
|
to set <I>barrier</I> to an invalid value. An error code is returned if <B>pthread_barrier_destroy</B> is called when any thread is
|
|||
|
|
blocked on the barrier, or if this function is called with an
|
|||
|
|
uninitialized barrier.
|
|||
|
|
</P>
|
|||
|
|
<P>The <B>pthread_barrier_init</B> function shall allocate any
|
|||
|
|
resources required to use the barrier referenced by <I>barrier</I>
|
|||
|
|
and shall initialize the barrier with attributes referenced by <I>attr</I>.
|
|||
|
|
If <I>attr</I> is NULL, the default barrier attributes shall be used;
|
|||
|
|
the effect is the same as passing the address of a default barrier
|
|||
|
|
attributes object. The results are undefined if <B>pthread_barrier_init</B>
|
|||
|
|
is called when any thread is blocked on the barrier (that is, has not
|
|||
|
|
returned from the <A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
|
|||
|
|
call). The results are undefined if a barrier is used without first
|
|||
|
|
being initialized. The results are undefined if <B>pthread_barrier_init</B>
|
|||
|
|
is called specifying an already initialized barrier.
|
|||
|
|
</P>
|
|||
|
|
<P>The <I>count</I> argument specifies the number of threads that
|
|||
|
|
must call <A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
|
|||
|
|
before any of them successfully return from the call. The value
|
|||
|
|
specified by <I>count</I> must be greater than zero.
|
|||
|
|
</P>
|
|||
|
|
<P>If the <B>pthread_barrier_init</B> function fails, the barrier
|
|||
|
|
shall not be initialized and the contents of <I>barrier</I> are
|
|||
|
|
undefined.
|
|||
|
|
</P>
|
|||
|
|
<P>Only the object referenced by <I>barrier</I> may be used for
|
|||
|
|
performing synchronization. The result of referring to copies of that
|
|||
|
|
object in calls to <B>pthread_barrier_destroy</B> <B>or</B>
|
|||
|
|
<A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
|
|||
|
|
is undefined.</P>
|
|||
|
|
<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
|
|||
|
|
<P>Upon successful completion, these functions shall return zero;
|
|||
|
|
otherwise, an error number shall be returned to indicate the error.
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
|
|||
|
|
<P>The <B>pthread_barrier_destroy</B> function may fail if:
|
|||
|
|
</P>
|
|||
|
|
<DL>
|
|||
|
|
<DT><B>EBUSY</B>
|
|||
|
|
</DT><DD>
|
|||
|
|
The implementation has detected an attempt to destroy a barrier
|
|||
|
|
while it is in use (for example, while being used in a
|
|||
|
|
<A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
|
|||
|
|
call) by another thread.
|
|||
|
|
</DD><DT>
|
|||
|
|
<B>EINVAL</B>
|
|||
|
|
</DT><DD STYLE="margin-bottom: 0.5cm">
|
|||
|
|
The value specified by <I>barrier</I> is invalid.
|
|||
|
|
</DD></DL>
|
|||
|
|
<P>
|
|||
|
|
The <B>pthread_barrier_init</B> function shall fail if:
|
|||
|
|
</P>
|
|||
|
|
<DL>
|
|||
|
|
<DT><B>EAGAIN</B>
|
|||
|
|
</DT><DD>
|
|||
|
|
The system lacks the necessary resources to initialize another
|
|||
|
|
barrier.
|
|||
|
|
</DD><DT>
|
|||
|
|
<B>EINVAL</B>
|
|||
|
|
</DT><DD>
|
|||
|
|
The value specified by <I>count</I> is equal to zero.
|
|||
|
|
</DD><DT>
|
|||
|
|
<B>ENOMEM</B>
|
|||
|
|
</DT><DD STYLE="margin-bottom: 0.5cm">
|
|||
|
|
Insufficient memory exists to initialize the barrier.
|
|||
|
|
</DD></DL>
|
|||
|
|
<P>
|
|||
|
|
The <B>pthread_barrier_init</B> function may fail if:
|
|||
|
|
</P>
|
|||
|
|
<DL>
|
|||
|
|
<DT><B>EBUSY</B>
|
|||
|
|
</DT><DD>
|
|||
|
|
The implementation has detected an attempt to reinitialize a barrier
|
|||
|
|
while it is in use (for example, while being used in a
|
|||
|
|
<A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
|
|||
|
|
call) by another thread.
|
|||
|
|
</DD><DT>
|
|||
|
|
<B>EINVAL</B>
|
|||
|
|
</DT><DD STYLE="margin-bottom: 0.5cm">
|
|||
|
|
The value specified by <I>attr</I> is invalid.
|
|||
|
|
</DD></DL>
|
|||
|
|
<P>
|
|||
|
|
These functions shall not return an error code of [EINTR].
|
|||
|
|
</P>
|
|||
|
|
<P><I>The following sections are informative.</I>
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc5" NAME="sect5">Examples</A></H2>
|
|||
|
|
<P>None.
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc6" NAME="sect6">Application Usage</A></H2>
|
|||
|
|
<P>The <B>pthread_barrier_destroy</B> and <B>pthread_barrier_init</B>
|
|||
|
|
functions are part of the Barriers option and need not be provided on
|
|||
|
|
all implementations.
|
|||
|
|
</P>
|
|||
|
|
<P><B>Pthreads-w32</B> defines <B>_POSIX_BARRIERS</B> to indicate
|
|||
|
|
that these routines are implemented and may be used.</P>
|
|||
|
|
<H2><A HREF="#toc7" NAME="sect7">Rationale</A></H2>
|
|||
|
|
<P>None.
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc8" NAME="sect8">Future Directions</A></H2>
|
|||
|
|
<P>None.
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc11" NAME="sect11">Known Bugs</A></H2>
|
|||
|
|
<DL>
|
|||
|
|
<DD STYLE="margin-left: 0cm; margin-bottom: 0.5cm">In
|
|||
|
|
<B><SPAN LANG="en-GB"><SPAN LANG="en-GB">pthreads-win32</SPAN></SPAN></B>,
|
|||
|
|
the behaviour of threads which enter <A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
|
|||
|
|
while the barrier is being destroyed is undefined.
|
|||
|
|
</DD></DL>
|
|||
|
|
<H2>
|
|||
|
|
<A HREF="#toc9" NAME="sect9">See Also</A></H2>
|
|||
|
|
<P><A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
|
|||
|
|
<B>,</B> the Base Definitions volume of IEEE Std 1003.1-2001,
|
|||
|
|
<I><pthread.h></I>
|
|||
|
|
</P>
|
|||
|
|
<H2><A HREF="#toc10" NAME="sect10">Copyright</A></H2>
|
|||
|
|
<P>Portions of this text are reprinted and reproduced in electronic
|
|||
|
|
form from IEEE Std 1003.1, 2003 Edition, Standard for Information
|
|||
|
|
Technology -- Portable Operating System Interface (POSIX), The Open
|
|||
|
|
Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the
|
|||
|
|
Institute of Electrical and Electronics Engineers, Inc and The Open
|
|||
|
|
Group. In the event of any discrepancy between this version and the
|
|||
|
|
original IEEE and The Open Group Standard, the original IEEE and The
|
|||
|
|
Open Group Standard is the referee document. The original Standard
|
|||
|
|
can be obtained online at <A HREF="http://www.opengroup.org/unix/online.html">http://www.opengroup.org/unix/online.html</A>
|
|||
|
|
.
|
|||
|
|
</P>
|
|||
|
|
<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P>
|
|||
|
|
<HR>
|
|||
|
|
<P><A NAME="toc"></A><B>Table of Contents</B></P>
|
|||
|
|
<UL>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Return
|
|||
|
|
Value</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Errors</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Examples</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Application
|
|||
|
|
Usage</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">Rationale</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Future
|
|||
|
|
Directions</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect11" NAME="toc11">Known
|
|||
|
|
Bugs</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect9" NAME="toc9">See
|
|||
|
|
Also</A>
|
|||
|
|
</P>
|
|||
|
|
<LI><P><A HREF="#sect10" NAME="toc10">Copyright</A>
|
|||
|
|
</P>
|
|||
|
|
</UL>
|
|||
|
|
</BODY>
|
|||
|
|
</HTML>
|